/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineGroupsInterface.h
What groups does a particular user currently belong to and what roles do they fill
typedef [IGroupUserCollection](API\Plugins\OnlineSubsystem\Interfaces\IGroupUserCollection)< [FUserMembershipEntry](API\Plugins\OnlineSubsystem\Interfaces\FUserMembershipEntry) > IUserMembership